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    Wellbore fluid circulation system and method
    32.
    发明专利
    Wellbore fluid circulation system and method 未知

    公开(公告)号：GB2411921B

    公开(公告)日：2007-06-13

    申请号：GB0510605

    申请日：2005-05-24

    Applicant: BAKER HUGHES INC

    Inventor： WATKINS LARRY A ,  FONTANA PETER ,  FINCHER ROGER ,  ARONSTAM PETER S

    IPC: E21B21/00 ,  E21B21/08

    Abstract: The present invention provides drilling systems for drilling wellbores. The drilling system includes an umbilical that passes through a wellhead and carries a drill bit. A drilling fluid system supplies drilling fluid into an annulus (supply line) between the umbilical and the wellbore, which discharges at the drill bit bottom and returns to the wellhead through the umbilical (return line) carrying the drill cuttings. A fluid circulation device, such as a turbine or centrifugal pump, is operated in the return line to provide the primary motive force for circulating drilling fluid through a fluid circuit formed by the supply line and return line. Optionally, a secondary fluid circulation device in fluid communication with the return line can cooperate with the fluid circulation device to circulate drilling fluid and/or a near bit fluid circulation device can be used to provide localized flow control or suction pressure to improve bit cleaning.

    Drilling systems and methods utilizing independently deployable multiple tubular strings
    33.
    发明专利
    Drilling systems and methods utilizing independently deployable multiple tubular strings 未知

    公开(公告)号：GB2430960A

    公开(公告)日：2007-04-11

    申请号：GB0700185

    申请日：2005-06-22

    Applicant: BAKER HUGHES INC

    Inventor： FINCHER ROGER ,  SINOR ALLEN ,  WATKINS LARRY A ,  WILMER JOEL

    IPC: E21B7/20 ,  E21B7/06 ,  E21B10/26 ,  E21B17/07 ,  E21B17/14 ,  E21B43/10 ,  E21B49/00

    Abstract: A novel well bore drilling system and method utilizes independently deployable multiple tubular strings to drill, line and cement multiple hole sections without intervening trips to the surface. In one embodiment, the drilling system includes two or more independent, telescoping, tubular members that form a nested tubular assembly and one or more sensors disposed on the nested tubular assembly. The nested tubular string (10) is deployed in the wellbore in conjunction with a Bottom Hole Assembly (BHA) (100). In some embodiments, a drilling motor (1020, 1120, 1220) for rotating a drill bit is also positioned in the tubular assembly. The sensors can be disposed in a stator of the drilling motor or adjacent the motor. Also, in embodiments, the sensors (1130) can be positioned on extensible members (1140) that can position the sensor or sensors adjacent the wellbore wall (1154).

    STEERABLE BIT ASSEMBLY AND METHODS
    36.
    发明专利
    STEERABLE BIT ASSEMBLY AND METHODS 未知

    公开(公告)号：CA2539097A1

    公开(公告)日：2005-03-31

    申请号：CA2539097

    申请日：2004-09-13

    Applicant: BAKER HUGHES INC

    Inventor： ARONSTAM PETER S ,  WATKINS LARRY A ,  FINCHER ROGER W

    IPC: E21B7/06 ,  E21B10/60 ,  E21B10/61 ,  E21B10/62 ,  E21B17/10

    Abstract: A drilling system includes a steerable bottOmhole assembly (BHA) having a steering unit and a control unit that provide dynamic control of drill bit orientation or tilt. Exemplary steering units can adjust bit orientation at a rate that approaches or exceeds the rotational speed of the drill string or drill bit, can include a dynamically adjustable articulated joint having a plurality of elements that deform in response to an excitation signal, can include adjustable independently rotatable rings for selectively tilting the bit, and/or can include a plurality of selectively extensible force pads. Th e force pads are actuated by a shape change material that deforms in response to an excitation signal. A method of directional drilling includes continuously cycling the position of the steering unit based upon the rotational speed of the drill string and/or drill bit and with reference to an external referenc e point.

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